Question

7 b, d va roggggggg!!!!!!!

Answer 1

Răspuns:

Explicație pas cu pas:

b)

D₂₆={ 1,2,13 ,26 }.............D₂₆= divizorii lui 26

2x+1 l 26

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2x+1= 1

2x= 1-1

2x=0

x= 0 ∈N

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2x+1=2

2x= 2-1

2x= 1

x= 1/2 ∉N

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2x+1= 13

2x=13-1

2x=12

x= 12:2

x=6∈N

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2x+1=26

2x=26-1

2x=25

x= 25/2  ∉N

-

x= { 0,6}

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d)

D₇₀= { 1,2,5,7,10 ,14 ,35 ,70 }

-

2x+5= 1

2x= 1-5

2x=-4

x= -4:2

x=-2∉N

-

2x+5= 2

2x=2-5

2x=-3

x=- 3/2∉N

-

2x+5= 5

2x=5-5

2x=0

x=0 ∈N

-

2x+5= 7

2x=7-5

2x=2

x= 2:2

x=1∈N

-

2x+5= 10

2x= 10-5

2x= 5

x= 5/2∉N

-

-

2x+5=14

2x=14-5

2x=9

x= 9/2∉N

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2x+5=35

2x= 35-5

2x=30

x=30:2

x= 15 ∈N

-

-

2x+5=70

2x=70-5

2x=65

x= 65/2 ∉N

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x={ 0,1,15 }